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Grammarly AI Detector checker & guide

Grammarly AI Detector: lower the score and prove you wrote it.

Grammarly checks for AI text and, with Authorship, records how a document was written. Fix the AI-like sentences here, then let your writing process do the proving.

Updated 2026-10-31 · Independent guide, not affiliated with Grammarly AI Detector

Free AI detection checker — Grammarly AI Detector pre-checkRuns in your browser · text never uploaded · no signup
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Independent heuristic estimate of the signals detectors use (predictability, burstiness, stock AI phrasing, repetitive structure). It is not GPTZero, ZeroGPT or Turnitin, and real scores can differ.

Step by step

How to bypass Grammarly AI Detector in 4 steps

1

Pre-check

Paste your draft into the checker above. Note your AI-likeness score and burstiness.

2

Fix red sentences

Hover each red sentence to see the signal it triggers, then rewrite it in your own structure.

3

Add what only you know

A number, a source, an example, an opinion. Grammarly AI Detector can't see specificity in a generic draft.

4

Re-check, then submit

Run the checker again. When most sentences are green, it reads as yours.

What is Grammarly AI Detector?

What Grammarly AI Detector is and who uses it

Grammarly offers a free AI detector that shows what percentage of a text appears AI-generated. It also offers Grammarly Authorship, which tracks whether text in a document was typed, pasted or generated with AI, and creates a report you can share with a teacher or client.

That makes Grammarly different: it's not only a detector but also a way to show your process, which is the most reliable defence against false accusations.

How Grammarly AI Detector scores your text

  • AI percentage: Estimates what share of the text looks AI-generated.
  • Authorship tracking: Records typed vs pasted vs AI-generated text as you write in supported apps.
  • Shareable reports: Authorship reports can be shared with reviewers.
  • Built into the editor: Many students already have it installed, so it's a common self-check.

Where Grammarly AI Detector gets it wrong

  • Heavy use of Grammarly's own generative rewrites raises the AI percentage.
  • Formal or formulaic writing can be over-flagged.
  • The percentage alone can be misread as proof.
  • Authorship only helps if it was running while you wrote.

What actually works against Grammarly AI Detector

  1. Turn on Authorship before you start writing important work.
  2. Accept correctness fixes, but be careful with full-sentence AI rewrites.
  3. Rewrite flagged sentences in your own words using the checker's suggestions.
  4. Add concrete detail and opinion in each paragraph.
  5. If you're accused, share the Authorship report and your drafts.

Want a second opinion on a rewrite? The MultipleChat humanizer (ranked #1 in our humanizer test) lets you compare rewrites from several AI models side by side, then you pick and edit the version that sounds like you.

Other detectors

Check against other AI detectors

Teachers and clients often run more than one detector. Fixing the underlying patterns helps with all of them.

Bypass GPTZeroPerplexity + burstiness, sentence highlightsBypass ZeroGPTFree % score, DeepAnalyse highlightsBypass TurnitinInstitution-only AI writing indicatorBypass Originality.aiStrict, paid, built for publishersBypass CopyleaksAI + plagiarism, LMS integrationsBypass Winston AIHuman score + OCR for imagesBypass SaplingFree, token-level highlightingBypass ScribbrStudent-focused, free & premiumBypass QuillBot AI DetectorFour labels incl. AI-refinedBypass Grammarly AI DetectorFree % plus Authorship proofBypass PangramLow false-positive claims, research useBypass Writer AI DetectorFree, short-text marketing check

FAQ

Grammarly AI Detector FAQ

Does using Grammarly make my text look like AI?

Spelling and grammar fixes usually don't. Accepting many generative rewrites can raise AI detector scores.

What is Grammarly Authorship?

A feature that records how text was added to a document (typed, pasted, AI-generated) and creates a shareable report.

Is Grammarly's AI detector free?

Yes, Grammarly offers a free AI detector on its website.

Can Grammarly prove I didn't use AI?

Authorship reports show your writing process, which is strong supporting evidence. No tool gives absolute proof.

Use it the right way

Better writing beats gaming a score.

AI detectors are probabilistic and get things wrong, which is why it makes sense to check your text first. But the goal is clear, specific writing that is genuinely yours, not hiding AI use where it's banned.